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I just finished to setup our off-site backup . Since the admin in the data center where out off-site backup machine is hosted asked for a pull method, I had to setup a "secure" rsync jail to allow him/her to move our data. To this end, I installed rssh, rsync and I setup a simple jail for it.

I've modified a script to backup live xen images with dar. This script uses lvm to snapshot a running VM disk, then mount it read only and uses dar to create an incremental backup. The script is a derivative of a script I've found on the net [1]. There is still a small problem with journaled file system that even if the fs is frozen before taking the snapshot, for some reason, even if I mount it read only, the kernel module tries to go through the journal to recover the fs. I'm worried that this might lead to data corruptions...